The Differential Mortality from Cancer in the White and Colored Population

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Abstract
While studying the trend of Negro mortality from various causes, I have endeavored for the purpose of comparison to secure a large amount of statistical material from the same geographical area. This is especially important in studying the statistics of cancer. For some reason cancer rates vary under different climatic and other environmental influences, and the comparison of data over a series of years from a region of varying extent, such as the expanding U. S. Registration Area for Deaths, involves several sources of error. In order to avoid these and still have a large body of statistical material, I have compiled from the volumes on mortality statistics the data on cancer mortality in the Registration States of 1920, from 1920 to 1930. The mere compilation of the number of deaths in the white and colored population of this region is of course a very simple matter. The calculation of death rates, however, presents certain complications, and for the sake of the critical student of vital statistics an account of the procedure followed is given.

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